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<br />Facility Audit Report 4 <br />San Leandro WWTF <br />Figure 1.2.1 -- Aerial View of the San Leandro WWTF <br /> <br />Plant Treatment Components: 1 – Headworks; 2 – Primary Clarifiers; 3 – Fixed Film Reactor; 4 – Aeration <br />Basins; 5 – Secondary Clarifiers; 6 – Disinfection; 7 – Discharge; 8 – Secondary Sludge Thickener; <br />9 – Anaerobic Digester; 10 – Cogeneration; 11 – Biosolids Dewatering <br /> <br /> <br />2. TARGETED PROCESS SYSTEMS AND EQUIPMENT <br />2.1 Description of Facility and Operational Systems <br />2.1.1 Aeration Blower Retrofit <br />Two 659,000 gallon aeration basins are supplied with air by three 150 HP Lamson multistage <br />centrifugal model 867AD blowers, as shown in Figure 2.1.1.1. Only one of the two basins is in <br />operation (online) at any given time; the other is offline in a standby mode. Aeration is <br />accomplished with fine bubble diffusers. The offline basin maintains a water cover over the <br />diffusers, which are usually supplied air to keep the diffusers in operation. <br /> <br />